Step 1: Understanding the Question:
The question asks to match major international agricultural research centers (CGIAR centers) with their primary "mandate crops" (the crops they are responsible for improving).
Step 2: Detailed Explanation:
• ICRISAT (A-II): International Crops Research Institute for the Semi-Arid Tropics, located in Hyderabad, India. Its mandate includes crops like Pigeonpea, Chickpea, Groundnut, and Millets.
• IITA (B-IV): International Institute of Tropical Agriculture, located in Ibadan, Nigeria. It works on crops essential for the tropics, primarily Cowpea, Yam, and Soybean.
• CIAT (C-III): International Center for Tropical Agriculture, located in Palmira, Colombia. Its major mandate crop is Cassava (Manioc), along with beans and rice for the region.
• CIMMYT (D-I): International Maize and Wheat Improvement Center, located in El Batán, Mexico. Its name is derived from Spanish initials. The major mandate crops are Wheat and Maize.
Final Answer:
The matching results in A-II, B-IV, C-III, and D-I.
This corresponds to option (B).